Pause for a moment on this one. Why would it go out of date?
The oldest content currently listed on the front page of my website is from 2005. What is in it has not gone out of date in the slightest. In fact, nothing from the intervening fourteen years has gone out of date. I could probably dig back through archive.org and pick out some more from sites I had back in the 1990's that would still be perfectly good, up to date content today.
If what you're writing is substantive, not gossip, there is no reason to think about it going out of date. Just don't wrap it in a blog format where the structure of the site makes it look like it's going out of date.